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31 lines
1.3 KiB
JavaScript
31 lines
1.3 KiB
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --harmony-intl-segmenter
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const segmenter = new Intl.Segmenter();
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const text = "Hello World, Test 123! Foo Bar. How are you?";
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const iter = segmenter.segment(text);
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assertEquals("function", typeof iter.preceding);
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// ToNumber("ABC") return NaN, ToInteger("ABC") return +0, ToIndex("ABC") return 0
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assertThrows(() => iter.preceding("ABC"), RangeError);
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// ToNumber(null) return +0, ToInteger(null) return +0, ToIndex(null) return 0
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assertThrows(() => iter.preceding(null), RangeError);
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assertThrows(() => iter.preceding(-3), RangeError);
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// ToNumber(1.4) return 1.4, ToInteger(1.4) return 1, ToIndex(1.4) return 1
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assertDoesNotThrow(() => iter.preceding(1.4));
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// 1.5.3.3 %SegmentIteratorPrototype%.preceding( [ from ] )
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// 3.b If ... from = 0, throw a RangeError exception.
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assertThrows(() => iter.preceding(0), RangeError);
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// 1.5.3.3 %SegmentIteratorPrototype%.preceding( [ from ] )
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// 3.b If from > iterator.[[SegmentIteratorString]] ... , throw a RangeError exception.
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assertDoesNotThrow(() => iter.preceding(text.length - 1));
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assertDoesNotThrow(() => iter.preceding(text.length));
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assertThrows(() => iter.preceding(text.length + 1), RangeError);
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